Fenceline support base



FIG. 1 is a front side perspective view of a fenceline support base;

FIG. 2 is a front side elevation thereof;

FIG. 3 is a rear side elevation of the end opposite that shown in (FIG. 2);

FIG. 4 is a right side elevation thereof, wherein the left side opposite is a mirror thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view thereof showing environment;

FIG. 8 is a perspective view thereof showing environment; and,

FIG. 9 is another perspective view showing environment.

The dash-dash broken lines depict environment that forms no part of the claimed design. 

CLAIM The ornamental design for a fenceline support base, as shown and described. 